Diamond



FIG. 1 is a perspective view of a diamond showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a side-front view thereof; and,

FIG. 6 is a side-back view thereof. 

I claim the ornamental design for a diamond, as shown. 